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HG/T 20592 法兰 SO 450-16 M77.5 RJ10�.20m@Scc RJ80 RJ-S1@m@S6SF8p40rf0-R0sa5 RJ0SMch16 RF0-300RFFMrff�6f10040630-6rfs=12=16000-1=7450r60=1280S- r Ss RF252pf